KR20050056202A - Display device - Google Patents
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- KR20050056202A KR20050056202A KR1020057002772A KR20057002772A KR20050056202A KR 20050056202 A KR20050056202 A KR 20050056202A KR 1020057002772 A KR1020057002772 A KR 1020057002772A KR 20057002772 A KR20057002772 A KR 20057002772A KR 20050056202 A KR20050056202 A KR 20050056202A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3216—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using a passive matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
- G09G3/3241—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
Description
본 발명은 적어도 하나의 화상 요소를 포함하는 디스플레이 디바이스 및 상기 화상 요소와 직렬 연결된 구동 트랜지스터를 구비하는 디스플레이 드라이버 디바이스에 관한 것이다.The present invention relates to a display device comprising at least one picture element and a display driver device having a drive transistor connected in series with the picture element.
그러한 디스플레이 디바이스는, 또한 발광 다이오드(polyLED 또는 OLED)라고 알려져 있는, 전자발광 반도체 유기 재료에 점차 기초를 두고 있다. 이 디스플레이 디바이스는 단편화된 픽셀(또는 고정된 패턴)을 통해 발광할 수도 있으나 매트릭스 패턴에 의한 디스플레이 또한 가능하다. 일반적으로 다이오드 전류를 조정하는 것에 의해 상기 픽셀에서 방출되는 광의 세기가 결정된다. Such display devices are increasingly based on electroluminescent semiconductor organic materials, also known as light emitting diodes (polyLEDs or OLEDs). The display device may emit light through fragmented pixels (or fixed patterns), but display by matrix patterns is also possible. In general, adjusting the diode current determines the intensity of light emitted from the pixel.
디스플레이 디바이스의 적절한 응용 분야는, 예를 들어, 모바일 전화, 오거나이저(organizer) 등이다.Suitable applications for display devices are, for example, mobile phones, organizers, and the like.
개시 문단에서 서술된 타입의 디스플레이 디바이스는 USP 6,014,119에 기술되어 있다. 상기 문헌에서, LED를 통과하는 전류는 전류 제어기에 의하여 조정된다. 발광 픽셀 매트릭스 내의 각 픽셀 열에는, 바이폴러 트랜지스터와 저항을 포함하는 전류 드라이버가 구동 회로의 일부로 제공된다. 바이폴러 트랜지스터 대신에 MOS- 또는 TFT- 트랜지스터가 사용될 수 있다.Display devices of the type described in the opening paragraph are described in US Pat. No. 6,014,119. In that document, the current through the LED is regulated by the current controller. In each pixel column in the light emitting pixel matrix, a current driver comprising a bipolar transistor and a resistor is provided as part of the driving circuit. Instead of bipolar transistors, MOS- or TFT-transistors may be used.
재현가능한 그레이 스케일을 얻기 위해, 특정 그레이 값에 대한 전류는 실질적으로 일정하여야 한다. 그 이유는 트랜지스터가 일반적으로 일정한 전류 영역에서 사용되기 때문이다. 이 경우에, 높은 드레인-소스 전압(또는 바이폴러 트랜지스터의 경우에 에미터-콜렉터 전압)이 사용된다. 이것은, 예를 들어 드라이버의 공급 전압 또는 픽셀 다이오드의 순방향 특성의 변화로 인해 드레인 전압의 변화에 트랜지스터의 바이어스가 덜 민감하게 만든다. To obtain a reproducible gray scale, the current for a particular gray value must be substantially constant. This is because transistors are generally used in a constant current region. In this case, a high drain-source voltage (or emitter-collector voltage in the case of bipolar transistors) is used. This makes the bias of the transistor less sensitive to changes in drain voltage, for example due to a change in the driver's supply voltage or the forward characteristics of the pixel diode.
그러나, 디스플레이 디바이스와 디스플레이 드라이버 회로의 대량 생산시에는 문제가 발생하는데, 이는 드라이버 회로의 출력의 수는 구동 전류가 제공되는 열의 수보다 더 많을 수 있기 때문이다. 이들 출력 드라이버는 예를 들어 구동 회로(예를 들어, 디스플레이의 에지에 있는 열)에 공급되는 정보가 화상을 적절히 디스플레이 하는데 필수적이지 않거나 또는 디스플레이 내 열의 수가 드라이버 회로에 이용가능한 열 드라이버 출력의 수보다 더 적을 때에 배치될 수 있다. 출력 드라이버가 전류 소스로서 작용하기 때문에, 그 출력 노드의 전압은 급속히 증가(또는 감소)하며, 이 증가는 공급 전압에 의해 제한된다. 열 접속이 파괴된 경우에도 유사한 증가가 발생한다. 출력 노드에서의 전압은 특정 작업 영역 내로 전류 공급을 유지하도록 출력 노드와 공급 노드 사이에 특정 전압 값을 유지하도록 모니터된다. 이제, 출력 노드 중 하나의 전압이 증가하는 경우, 공급 노드 전압이 또한 증가하여, 출력 노드 등을 증가하게 한다.However, problems occur in mass production of display devices and display driver circuits because the number of outputs of the driver circuits may be more than the number of columns provided with the drive current. These output drivers, for example, do not require that information supplied to the drive circuitry (e.g., columns at the edge of the display) be necessary to properly display the image, or that the number of columns in the display is greater than the number of column driver outputs available to the driver circuit. Can be deployed when less. Because the output driver acts as a current source, the voltage at its output node increases (or decreases) rapidly, and this increase is limited by the supply voltage. Similar increase occurs when the thermal connection is broken. The voltage at the output node is monitored to maintain a specific voltage value between the output node and the supply node to maintain a current supply into the specific working area. Now, when the voltage of one of the output nodes increases, the supply node voltage also increases, causing the output node and the like to increase.
이것은 디스플레이 디바이스와 디스플레이 드라이버 회로에서 모두 과도한 전력 소비를 초래한다.This causes excessive power consumption in both the display device and the display driver circuit.
이와는 별도로, 출력 전류(또는 출력 노드 전압)는 온도 변화로 인해 변할 수 있는 반면, 다른 열 드라이버(및 또한 다른 열)도 또한 그 거동에 있어 달라질 수 있다.Apart from this, the output current (or output node voltage) may change due to temperature changes, while other column drivers (and also other columns) may also vary in their behavior.
도 1은 본 발명에 따른 디스플레이 디바이스를 개략적으로 도시하는 도면.1 shows schematically a display device according to the invention;
도 2는 도 1의 실시예에서 사용되는 트랜지스터의 트랜지스터 특성을 도시하는 도면.FIG. 2 is a diagram showing transistor characteristics of a transistor used in the embodiment of FIG.
도 3은 본 발명에 따른 일 실시예를 도시하는 도면.3 shows an embodiment according to the invention.
도 4 및 도 5는 본 발명에 따른 드라이버 회로의 다른 실시예를 도시하는 도면.4 and 5 show another embodiment of a driver circuit according to the present invention.
본 도면들은 개략적인 것이며, 여기서 대응하는 구성요소는 일반적으로 동일한 참조 부호에 의해 지시되어 있다. The figures are schematic, wherein corresponding components are generally indicated by the same reference numerals.
본 발명의 목적은, 특히 출력 노드 전압의 변동 및 전력 소비에 있어서의 변동이 최소화되며 특히 개방 드라이버 출력 노드로 인한 추가 전력 소비가 가능한 한 방지되는, 개시 문단에서 서술된 타입의 디스플레이 디바이스를 제공하는 것이다. 이를 위해, 본 발명의 구성요소에 따른 디스플레이 디바이스에서 디스플레이 드라이버 디바이스는 디스플레이 드라이버 디바이스의 출력 전압을 모니터하는 (예를 들어 임계 전압에 도달하는 출력 전압의 값을 신호 출력하는) 수단을 포함한다.It is an object of the present invention to provide a display device of the type described in the opening paragraph, in particular that the fluctuations in the output node voltage and in the power consumption are minimized and in particular the additional power consumption due to the open driver output node is prevented as much as possible. will be. To this end, the display driver device in the display device according to the components of the present invention comprises means for monitoring (eg signal outputting the value of the output voltage reaching the threshold voltage) of the display driver device.
본 발명에 따른 디스플레이 디바이스의 바람직한 실시예는 디스플레이 드라이버 디바이스의 기준 전압을 제어하는 피드백 메커니즘을 포함한다. 이 기준 전압은 일반적으로 공급 노드 전압일 수 있으나, 또한 이것은 상기 공급 노드 전압이나 임의의 다른 적절한 전압 노드를 직접 또는 간접으로 결정하는 전압일 수 있다. 피드백 메커니즘을 통해, 공급 노드와 출력 노드 사이의 전압 값은, 이 전압 값을 과도하게 높은 값으로 제공하지 않고 {전류 공급이 특정 작업 영역(일정한 전류 영역)에 유지되도록 하는 값으로) 거의 일정하게 유지된다. 이를 위해, 피드백 메커니즘은 화상 요소에 대한 디스플레이 드라이버 디바이스의 출력 전압과 임계 전압 아래에 있는 기준 전압 사이의 차이를 신호 출력하는 제어 회로를 바람직하게 포함한다. 개방 드라이버 출력 노드로 인한 추가 전력 소비를 방지하기 위해, 디스플레이 드라이버 디바이스는 차이를 신호 출력한 후에 디스플레이 드라이버 디바이스의 개방 출력을 검출하는 수단을 포함한다. A preferred embodiment of the display device according to the invention comprises a feedback mechanism for controlling the reference voltage of the display driver device. This reference voltage may generally be a supply node voltage, but it may also be a voltage that directly or indirectly determines the supply node voltage or any other suitable voltage node. Through a feedback mechanism, the voltage value between the supply node and the output node is almost constant (to a value that allows the current supply to remain in a specific working area (constant current area)) without providing this voltage value excessively high. maintain. To this end, the feedback mechanism preferably comprises a control circuit which signals the difference between the output voltage of the display driver device for the picture element and the reference voltage below the threshold voltage. To prevent additional power consumption due to the open driver output node, the display driver device includes means for detecting the open output of the display driver device after signaling the difference.
바람직한 실시예에 있어서, 디스플레이 드라이버 디바이스의 개방 출력을 검출하는 수단은 출력 전압을 모니터하는 수단의 일부를 포함하는 전류 경로를 포함한다. 상기 검출 수단은 디스플레이 드라이버 디바이스의 출력과 기준 전압 사이의 전류 경로에 스위치를 포함하거나 또는 디스플레이 드라이버 디바이스의 출력과 기준 전압 사이에 전류 경로의 퓨즈(fuse)를 포함할 수 있다.In a preferred embodiment, the means for detecting the open output of the display driver device comprises a current path comprising part of the means for monitoring the output voltage. The detection means may comprise a switch in the current path between the output of the display driver device and the reference voltage or a fuse in the current path between the output of the display driver device and the reference voltage.
본 발명의 이들 및 다른 측면은 이하 서술되는 실시예로부터 명백하며 이들 실시예를 참조하여 설명될 것이다.These and other aspects of the invention are apparent from the embodiments described below and will be described with reference to these embodiments.
도 1은 본 발명에 따른 디스플레이 디바이스(1)의 일부의 등가 회로도를 개략적으로 도시한다. 이 디스플레이 디바이스는, m개의 행(1,2,...m)과 n개의 열(1,2,...n)을 갖는 (P) LED 또는 (O) LED(4) 매트릭스를 포함한다. 이 디바이스는 행 선택 회로(6)와 데이터 레지스터(5)를 더 포함한다. 외부에서 제공되는 정보(7), 예를 들어, 비디오 신호는 처리 유닛(8)에서 처리되며, 이 처리 유닛(8)은 디스플레이될 정보에 따라, 라인(9)을 통해 데이터 레지스터(5)의 개별 부분(5-1,...,5-n)을 충전시킨다. 1 schematically shows an equivalent circuit diagram of a part of a display device 1 according to the invention. This display device comprises a matrix of (P) LEDs or (O) LEDs (4) with m rows (1,2, ... m) and n columns (1,2, ... n). . The device further comprises a row select circuit 6 and a data register 5. Externally provided information 7, for example a video signal, is processed in the processing unit 8, which, in accordance with the information to be displayed, is connected to the data register 5 via line 9. The individual parts 5-1, ..., 5-n are filled.
행의 선택은, 라인(3)을 통해 행 선택 회로(6)에 의하여, 이 예에서는, 요구되는 선택 전압을 라인에 제공하는 것(수동 어드레싱)에 의하여, 일어난다.The row selection takes place by the row selection circuit 6 via the line 3 in this example by providing the desired selection voltage to the line (manual addressing).
선택 동안, 이상적인 전류 소스인 것으로 간주될 수 있는 전류 소스(10)가 예를 들어 스위치(미도시)를 통해 데이터 레지스터(5)에 의하여 스위칭온 될 때, 데이터의 쓰기가 일어난다. 전류의 값은 데이터 레지스터의 내용에 의하여 결정되며, 데이터 라인(2)을 통해 LED(4)에 전압 공급 라인(11)을 거쳐 공급된다. 이 전압 라인(11)은 외부에서 제공될 수도 있고 또는 처리 유닛(8) 내의 전압으로부터 유도될 수 있다.During selection, the writing of data occurs when the current source 10, which can be considered to be an ideal current source, is switched on by the data register 5, for example via a switch (not shown). The value of the current is determined by the contents of the data register and is supplied to the LED 4 via the data line 2 via the voltage supply line 11. This voltage line 11 may be provided externally or may be derived from a voltage in the processing unit 8.
전류 스위치(10)는 각각 하나의 트랜지스터와 하나의 저항만을 포함하는 간단한 타입일 수 있다. 도입부에서 설명된 바와 같이, 트랜지스터의 바이어스가, 예를 들어, 드라이버의 공급 전압이나 픽셀 다이오드의 순방향 특성의 변화로 인해 드레인 전압의 변화에 덜 민감하게 하기 위하여, 트랜지스터는 일반적으로 일정한 전류 영역에서 사용된다. 그러나, 이때 요구되는 높은 드레인-소스는 특히 그 구동 거동이 여러 열마다 달라지는 경우에 전력 소비를 증가시킨다. 후자에 해당하는 열마다 다른 구동 거동은 또한 균일치 않은 발광 거동을 초래한다. The current switch 10 may be of a simple type, each including only one transistor and one resistor. As explained in the introduction, in order to make the bias of the transistor less susceptible to changes in drain voltage, for example, due to a change in the driver's supply voltage or the forward characteristics of the pixel diode, the transistor is generally used in a constant current region. do. However, the high drain-source required at this time increases power consumption, especially if its driving behavior varies from one row to the next. The driving behavior that differs for each of the columns corresponding to the latter also results in uneven luminescence behavior.
본 발명의 제 1 측면에 따라, {이 예에서, 행 선택 회로(6), 데이터 레지스터(5), 처리 유닛(8), 및 전류 드라이버(10)를 포함하는} 디스플레이 드라이버 디바이스는 또한 모니터 회로, 이 예에서 그 출력 전압을 모니터하며 디스플레이 드라이버 디바이스의 기준 전압을 피드백 메커니즘을 통해 제어하는 연산 증폭기(13)를 더 포함한다. 비록 별도의 구성요소로 도시되어 있지만, 이 연산 증폭기(13)는 일반적으로 처리 유닛(8)의 일부를 형성한다. 이 동작 전압의 값(Vop)은 상호 접속 라인(12)에 의하여 모니터된다. 드라이버 내의 전력 소비를 낮은 레벨로 유지하기 위해, Vds 값은 이 Vds 값에서 I0에 대해 (최대) 값을 허용하는 포인트 x에서 바이어스된다(도 2 참조). 연산 증폭기를 통해, 전압 라인(11)에서의 전압(Vsupply)은 Vop + Vds에 유지된다. 전압(Vop)이 일부 변동을 나타낼 수 있으므로, 처리 유닛(8)은 전압 라인(11)이 Vop,max + Vds에 유지하도록 하여, 동작 포인트 x가 도 2에서 화살표 14로 표시된 바와 같이 더 높은 전압으로 유동할 수 있다. 이것은, 프로세서(8)에서의 기준 전압과 Vop,max를 단순 비교하는 것에 의해 디스플레이(또는 디스플레이 드라이버 디바이스)의 활성 종료(end of life)를 검출하는데 사용될 수 있다. 이 기준 전압은 프로세서(8) 내에서 생성될 수도 있고 또는 외부에서 공급될 수도 있다. Vop가 특정 임계값을 지났는지를 검출한 후에, 프로세서(8)는 활성 종료 신호를 생성한다.According to a first aspect of the invention, a display driver device (in this example comprising a row select circuit 6, a data register 5, a processing unit 8, and a current driver 10) is also a monitor circuit. The operational amplifier 13 further monitors its output voltage in this example and controls the reference voltage of the display driver device via a feedback mechanism. Although shown as a separate component, this operational amplifier 13 generally forms part of the processing unit 8. The value V op of this operating voltage is monitored by the interconnect line 12. In order to keep the power consumption in the driver at a low level, the V ds value is biased at point x allowing a (maximum) value for I 0 at this V ds value (see FIG. 2). Through the operational amplifier, the voltage V supply at voltage line 11 is maintained at V op + V ds . Since the voltage V op may exhibit some variation, the processing unit 8 causes the voltage line 11 to remain at V op, max + V ds so that the operating point x is indicated by arrow 14 in FIG. 2. It can flow at higher voltages. This can be used to detect the active end of life of the display (or display driver device) by simply comparing V op, max with a reference voltage at processor 8. This reference voltage may be generated within the processor 8 or may be supplied externally. After detecting that V op has passed a certain threshold, processor 8 generates an active termination signal.
단순히 활성 종료 신호를 생성하는 대신에, 이 모니터링은, 출력 드라이버{전류 소스(10)}의 수가 열(2)의 수를 초과하는 경우, 바람직하게는 디스플레이 디바이스(1)에 디스플레이 드라이버 디바이스를 적응시키는데, 사용된다. 전류 소스(10) 중 하나가 {도 1의 예에서 이것은 열(n)에 대해 도시되어 있다} 하나의 열에 접속되지 않고 유지되는 경우 그 전류는 제로(0)이며, 그래서 Vds 값은 포인트 O에서 바이어스 될 수 있으며 Vop 는 값 Vsupply에 바이어스된다. 연산 증폭기(13)를 통해, 전압 라인(11)은 양의 피드백 메커니즘을 통해 이제 한정없이 증가할 수 있다(비록 이 증가가 외부에서 제공되는 전압에 의해 제한되긴 하지만).Instead of simply generating an active termination signal, this monitoring preferably adapts the display driver device to the display device 1 when the number of output drivers (current source 10) exceeds the number of columns 2. To be used. If one of the current sources 10 is kept unconnected to one column (in the example of FIG. 1 this is shown for column n) the current is zero (0), so the V ds value is point O V op is biased to the value V supply . Through the operational amplifier 13, the voltage line 11 can now increase indefinitely via a positive feedback mechanism (although this increase is limited by the externally provided voltage).
그러나, 본 발명에 따라, 전술된 바와 유사한 검출 메커니즘이 프로세서(8)에 포함되며, 이 프로세서(8)는 특정 임계값에서 Vop의 추가 증가를 중지시킨다(예를 들어, Vop, max가 값 Vsupply - Vds, min에 접근할 때).However, according to the present invention, a detection mechanism similar to that described above is included in the processor 8, which stops further increase of V op at a certain threshold (e.g., V op, max is Value V supply -when accessing V ds, min ).
도 3은 2개의 전류 소스(10), 구체적으로 LED(4)에 상호 접속된 하나의 전류 소스와, (개방) 출력(28)을 가지는 다른 전류 소스를 구비하는 보다 상세한 실시예를 도시한다. 각 전류 소스는 직렬 연결된 트랜지스터(21)와 2개의 저항(22, 23)을 포함하며, 그 2개의 저항 사이의 공통점은 검출 회로(24, 24')에 상호 접속되어, 검출 회로(24, 24')에 입력 전압(Vin)을 제공한다. 검출 회로(24, 24')에서, 전류 소스를 통한 전류가 모니터되며 전술된 바와 같은 특정 임계값과 비교된다. 상호 접속 라인(12)은 트랜지스터(27 및 26, 26')를 통해 제어 라인(11)을 제어하여 Vop, max + Vds에 유지되도록 한다. 개방 출력의 경우에, 명백한 것은 전류 소스를 통한 전류는 제로(0)이며, 그 결과 Vin = Vsupply 또는 Vin = Vsource가 되도록 한다. 예를 들어, 개방 출력(28)에 대응하는 검출 회로(24')에서 이것을 검출할 때, 스위치(26')는 개방되며, 제어 메커니즘은 중단되며, 그래서 이 개방 출력(28)은 더 이상 전술된 바와 같은 피드백 메커니즘으로 동작하지 못한다.FIG. 3 shows a more detailed embodiment with two current sources 10, in particular one current source interconnected to the LED 4, and another current source having an (open) output 28. Each current source includes a transistor 21 connected in series and two resistors 22, 23, the commonalities between the two resistors being interconnected to the detection circuits 24, 24 ′, so as to detect the circuits 24, 24. ') Provides the input voltage (V in ). In the detection circuit 24, 24 ′, the current through the current source is monitored and compared to a specific threshold as described above. Interconnect line 12 controls control line 11 through transistors 27 and 26, 26 'to be held at V op, max + V ds . In the case of an open output, what is clear is that the current through the current source is zero, resulting in V in = V supply or V in = V source . For example, when detecting this at the detection circuit 24 'corresponding to the open output 28, the switch 26' is opened and the control mechanism is interrupted, so this open output 28 is no longer described above. It does not work with the feedback mechanism as shown.
개방 출력은 예를 들어 도 4의 회로에 의하여 검출되며, 여기서 검출 회로(24)는 전류 소스(30)를 가지는 차동 증폭기, 2개의 트랜지스터(31)와 이 예에서 값 R을 갖는 2개의 저항(32)을 포함한다. 만약 트랜지스터(21)에 전류가 흐르지 않는 경우, 2개의 트랜지스터(22, 23)의 공통점은 라인(11)에서의 전압과 동일한 전압을 가지며, 그래서 두 트랜지스터(31)에서 전류(I30)의 절반만이 흘러, 출력(33)에서 전압 Vop,max + Vds - 1/2 I30·R을 유도한다. 이 전압은 대응하는 스위치(26')가 개방되도록 하는 값을 가지도록 선택된다.The open output is for example detected by the circuit of FIG. 4, where the detection circuit 24 is a differential amplifier having a current source 30, two transistors 31 and two resistors having a value R in this example ( 32). If no current flows in the transistor 21, the common point of the two transistors 22, 23 has the same voltage as the voltage in the line 11, so that half of the current I 30 in the two transistors 31. Only flows and induces the voltage V op, max + V ds -1/2 I 30 .R at the output 33. This voltage is selected to have a value that causes the corresponding switch 26 'to open.
적절한 전압에 접속된 드레인 단자를 가지고 다른 모든 트랜지스터(21)를 오프로 유지하면서 그 게이트 단자를 통해 트랜지스터(21)를 후속적으로 선택하는 것에 의해, 열의 출력에는 모든 열의 출력을 테스트하도록 특정 전류(I)(바람직하게는 Imax에 근접한)가 후속적으로 공급될 수도 있다.By subsequently selecting transistor 21 through its gate terminal with the drain terminal connected to the appropriate voltage and keeping all other transistors 21 off, the output of the column has a specific current (eg I) (preferably close to I max ) may be supplied subsequently.
특히 다수 개의 열이 사용되지 않고 다른 수의 열을 갖는 드라이버가 임의의 (다른) 용도로 사용되지 않는 경우에, 트랜지스터(21)와 출력(28) 사이에 퓨즈(40)를 도입하는 것만으로도 충분할 수 있다(도 5). 대응하는 트랜지스터(21)를 선택하고 적절한 전압을 그 대응하는 상호 접속 라인(12)과 전압 라인(11)에 공급하는 것에 의해 여분의 수의 출력이 제거될 수 있다. Especially when a driver with a large number of columns is not used and a driver with a different number of columns is not used for any (other) use, simply by introducing a fuse 40 between the transistor 21 and the output 28. May be sufficient (FIG. 5). The extra number of outputs can be eliminated by selecting the corresponding transistor 21 and supplying the appropriate voltage to its corresponding interconnect line 12 and voltage line 11.
본 발명의 보호 범위는 서술된 실시예로 제한되지 않는다. 본 발명은 능동 및 수동 디바이스, 매트릭스 및 단편화된 디스플레이 디바이스에 모두 적용가능하다. 드라이버 디바이스가 여러 종류의 디스플레이 디바이스(사이즈, 전력 소비, 전압)에 사용될 수 있으므로, 모니터되는 기준 전압이나 전압 차이는 프로그래밍될 수 있다. 본 발명은 또한 전계 발광 디바이스와 전류 구동에 기초한 다른 디바이스에도 적용가능하다. The protection scope of the present invention is not limited to the described embodiments. The invention is applicable to both active and passive devices, matrices and fragmented display devices. Since the driver device can be used for various kinds of display devices (size, power consumption, voltage), the monitored reference voltage or voltage difference can be programmed. The invention is also applicable to electroluminescent devices and other devices based on current driving.
본 발명은 각 그리고 모든 새로운 특성의 특징과 이들 특징의 각 그리고 모든 조합에 있다. 청구항에 있는 참조 부호는 이들 청구항의 보호 범위를 제한하지 않는다. "포함하는"이라는 동사와 그 활용어의 사용은 청구항에 언급된 요소 이외의 다른 요소의 존재를 배제하지 않는다. 어느 구성요소 앞에 있는 단수를 언급하는 용어의 사용은 그러한 요소의 복수의 존재를 배제하지 않는다. The present invention resides in features of each and every new feature and of each and every combination of these features. Reference signs in the claims do not limit the protection scope of these claims. The use of the verb "comprising" and its use does not exclude the presence of elements other than those mentioned in a claim. The use of the term referring to the singular preceding any component does not exclude the presence of a plurality of such elements.
전술된 바와 같이, 본 발명은 디스플레이 디바이스 등에 이용가능하다.As mentioned above, the present invention is applicable to display devices and the like.
Claims (16)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP02078454 | 2002-08-21 | ||
| EP02078454.2 | 2002-08-21 |
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| EP (1) | EP1532611B1 (en) |
| JP (1) | JP5183858B2 (en) |
| KR (1) | KR101035106B1 (en) |
| CN (1) | CN1675673B (en) |
| AU (1) | AU2003247111A1 (en) |
| TW (1) | TWM253877U (en) |
| WO (1) | WO2004019311A2 (en) |
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- 2003-07-18 EP EP03792543.5A patent/EP1532611B1/en not_active Expired - Lifetime
- 2003-07-18 WO PCT/IB2003/003281 patent/WO2004019311A2/en active Application Filing
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| US7589701B2 (en) | 2009-09-15 |
| WO2004019311A2 (en) | 2004-03-04 |
| US20060071882A1 (en) | 2006-04-06 |
| AU2003247111A8 (en) | 2004-03-11 |
| JP2005536772A (en) | 2005-12-02 |
| CN1675673B (en) | 2010-05-05 |
| TWM253877U (en) | 2004-12-21 |
| JP5183858B2 (en) | 2013-04-17 |
| EP1532611B1 (en) | 2015-09-09 |
| EP1532611A2 (en) | 2005-05-25 |
| WO2004019311A3 (en) | 2004-06-17 |
| CN1675673A (en) | 2005-09-28 |
| AU2003247111A1 (en) | 2004-03-11 |
| KR101035106B1 (en) | 2011-05-19 |
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